mwave offers the Compro Wireless USB 2.0 Adapter in Black, model no. WL155, for $16.99. Coupon code "7AA97447" drops it to $9.99. With free shipping, that's $20 off list and the lowest total price we could find. It's compatible with the Compro IP70 network security camera and features 802.11n wireless and a transfer rate of up to 150Mbps. Coupon expires June 30.